I had forgotten about these guys until they sent me a letter today asking for a donation. Hillsdale College is a liberal arts school that takes NO government grant money. As such, they are free to teach whatever they want. In their case, that means they teach courses firmly rooted in the Constitution and free market economics. They have made a subset of their courses available for free online.
Although this is not as fun as learning about guns or how to make sausage, I believe it is critically import information for every freedom-loving person to know backwards and forwards.